Fix for lint

Author: gmazoyer

backend/infrahub/core/migrations/graph/m043_backfill_hfid_display_label_in_db.py

@@ -447,7 +447,8 @@ async def _do_one_schema_batch(
 
         print("done")
 
-    async def execute_against_branch(self, db: InfrahubDatabase, branch: Branch) -> MigrationResult: ...
+    async def execute_against_branch(self, db: InfrahubDatabase, branch: Branch) -> MigrationResult:  # noqa: ARG002
+        return MigrationResult()
 
     async def execute(self, db: InfrahubDatabase) -> MigrationResult:
         root_node = await get_root_node(db=db, initialize=False)